A sample of special and elementary functions not admitting HeunG representation

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(5)

By default, the results are returned in terms of the lower Heun functions, that is, those with less parameters, in this case HeunB

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(6)

A representation in terms of higher Heun functions, in this case HeunC, because these functions being converted belong to the 1F1 class, can be obtained specifying HeunC instead of Heun in the call to convert